CN108746526A - The continuous cast method of bloom Properties of Heavy Rail Steel corner quality control - Google Patents
The continuous cast method of bloom Properties of Heavy Rail Steel corner quality control Download PDFInfo
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- CN108746526A CN108746526A CN201810700684.4A CN201810700684A CN108746526A CN 108746526 A CN108746526 A CN 108746526A CN 201810700684 A CN201810700684 A CN 201810700684A CN 108746526 A CN108746526 A CN 108746526A
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- heavy rail
- control
- rail steel
- bloom
- crystallizer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/009—Continuous casting of metals, i.e. casting in indefinite lengths of work of special cross-section, e.g. I-beams, U-profiles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
Abstract
The present invention relates to a kind of continuous cast methods of bloom Properties of Heavy Rail Steel corner quality control, are suitable for 280mm × 380mm section bloom Properties of Heavy Rail Steel strands, belong to bloom Properties of Heavy Rail Steel continuous casting technical field.The present invention is equipped using the tube type mold of gradual taper, and is rationally designed to the specific size of crystallizer, it is made to simplify the structure, it is easier to which manufacture and maintenance, the cooling of optimization strand corner improve the control of strand corner defect.In addition, by the fillet parameter designing to tube type mold, the control of strand corner defect is further improved；And by the improvement to cooling water channel, to ensure uniformity of conducting heat.Finally, in conjunction with control cast superheat of liquid steel, poring rate, stirring parameter, cooling parameter etc., it is ensured that bloom heavy rail steel continuous casting billet comprehensive quality high level controls.
Description
Technical field
The present invention relates to a kind of continuous cast methods of bloom Properties of Heavy Rail Steel corner quality control, and it is disconnected to be suitable for 280mm × 380mm
Face bloom Properties of Heavy Rail Steel strand belongs to bloom Properties of Heavy Rail Steel continuous casting technical field.
Background technology
Rail is the main building block of railroad track, in railway transport course, provides locomotive and effectively supports and draw
It leads, is subjected to the huge lateral pressure from wheel.Based on China's infrastructure growth requirement, railway transportation is just with swift and violent speed
Degree development, and constantly tend to high speed, heavy loading.Rail specification size also gradually increases, and to reduce welding point, ensures railway
The scale of the higher globality of rail, big specification rail is also increasing.By fixed compared with light section strand rolling large-size length in the past
The rail of ruler undoubtedly requires strand length scaling longer, this causes subsequent heat treatment equipment to need to carry out larger transformation；In addition, such as
If casting blank cross-section size is constant, and rail specification becomes large-sized, this undoubtedly impacts the compression ratio of the operation of rolling, final shadow
Ring the physical indexs such as rail consistency.In continuous casting production process, strand goes out after crystallizer, all heats of molten steel essentially by
Green shell discharges, and the solidification that the quality of green shell dramatically influences molten steel inside strand develops, including solidified structure is integrally uniform
Property and circumferential consistency etc., and for large section Properties of Heavy Rail Steel continuous casting, due to its steel grades and molten steel
The influence of solidification and heat transfer principle, casting blank solidification process cross-section temperature gradient is larger, and wick-containing is longer, and solidification of molten steel is held inside strand
The continuous time is longer, and effective control of green shell quality will establish important foundation, strand for the homoepitaxial of strand solidified inside tissue
Special part of the corner as green shell, due to the difference of shape, solidification and heat transfer uniformity controlling is difficult, and continuous casting billet corner quality
Control directly affect continuous casting billet milling lumber recovery.
Crystallizer is the component of most critical in continuous casting, it is known as " heart " of conticaster, crystallizer pair by industry
The important function of green shell quality control is embodied in：Casting blank shape is qualified when ensureing crystallizer, and has enough thickness to resist steel
Hydrostatic pressure and avoid bleedout；Ensure green shell along crystallizer circumferential direction homoepitaxial, above-mentioned effect determines continuous casting rate and casting
Base quality control.There are many scholars to carry out numerous studies to the control of solidification shell quality, research direction is concentrated mainly on
Thickness of solidified slab shell in secondary prediction, the mechanism of the acquisition of green shell safe thickness and casting process bleedout and detection control research.To big
The research of the control of square billet Properties of Heavy Rail Steel corner quality is relatively fewer, particularly with 280mm × 380mm section bloom Properties of Heavy Rail Steel angle
The specific research of portion's quality control equipment and technology, has no substantially.
Such as：
CN104384469A discloses the forecasting system and method for pre-hardening shell thickness in a kind of steel continuous casting crystallizer.This hair
It is bright to include：Information acquisition module：For acquiring casting steel grades, crystallizer geometric dimension, submersed nozzle geometric dimension, connecting
Casting process condition and pre-hardening shell thickness measured value along crystallizer different location and interdendritic are away from measured value；The crystallization
Device geometric dimension, including width of plate slab, slab thickness, crystallizer height, copper plate thickness, sink depth, sink thicknesses and nickel layer
Thickness；The continuous casting process condition, including meniscus position, casting speed, inlet water temperature, wide face exit water temperature, leptoprosopy outlet
Water temperature, wide face cooling water flow and leptoprosopy cooling water flow；The submersed nozzle geometric dimension, including submersed nozzle immerse
Depth and submersed nozzle side opening inclination angle；Steel grade thermal physical property parameter computing module：According to the collected casting of information acquisition module
Steel grades and interdendritic calculate interdendritic solute segregation and solidification path during solidification of molten steel, and then obtain away from measured value
Steel grade thermal physical property parameter simultaneously sends it to crystallizer initial set shell growth prediction module；The steel grade thermal physical property parameter, including it is solid
Liquidus temperature, thermal coefficient, density, specific heat and latent heat of solidification；Crystallizer initial set shell growth prediction module：It will be in crystallizer
Shape inside macroscopic transport process and crystallizer copper plate surface forming core, molten steel including heat transmission, MOMENTUM TRANSMISSION and mass transport
Microcosmic solidified structure including core and grain growth develops behavior and is coupled, and according to the collected crystallization of information acquisition module
Device geometric dimension, submersed nozzle geometric dimension and continuous casting process condition and from steel grade thermal physical property parameter computing module receive
Steel grade thermal physical property parameter predicts the internal high temperature solidification of molten steel process shell growth behavior of casting process crystallizer and sends it to knot
Fruit output module；As a result output module：Show to image conversion the crystallizer solidified inside tissue topography of prediction, i.e., pre-hardening green shell life
Growth process, and quantification show crystallizer initial set shell thickness predicted value, by the initial set shell thickness predicted value and information
The pre-hardening green shell measured value of the crystallizer of acquisition module acquisition is compared, and is exported and shown the comparison result.But for
The specific research of 280mm × 380mm section bloom Properties of Heavy Rail Steel corner quality control equipments and technology, is not directed to.
CN103386472A discloses a kind of acquisition methods of continuous cast mold outlet green shell safe thickness.The present invention includes
Following steps：Measure steel green shell surface temperature Tf, the width B of strand, roller spacing L, ferrostatic pressure P；It is calculated by formula
The elastic modulus E of tablet；Pass through the bending stiffness D of formula calculate flat board；It is calculated between crystallizer outlet and sufficient roller by formula
Maximum bulge deformation wmax；It is less than or equal to the critical bulge of green shell with the maximum bulge deformation wmax between crystallizer outlet and sufficient roller
Deformation quantity wc is criterion, determines the range of continuous cast mold outlet green shell safe thickness S；Wherein, α is numerical factor, and v is Poisson
Than Ts is the solidus temperature of steel.But the quality control of 280mm × 380mm section bloom Properties of Heavy Rail Steel corner is equipped
And the specific research of technology, it is not directed to.
CN101138785 discloses a kind of continuous cast method of bloom, and the technical solution of the invention is：The continuous casting of bloom
Method includes the secondary cooling to green shell, and wherein green shell passes sequentially through five spraying and cooling areas and carries out secondary cooling, five sprays
Cooling zone is respectively 151~194l/ (min × m along green shell cooling direction intensity of cooling2), 34~50l/ (min × m2), 23~
35l/(min×m2), 12~19l/ (min × m2), 8~11l/ (min × m2).The present invention passes through during green shell thickens
The intensity of cooling to green shell is continuously decreased, to effectively reduce the internal-external temperature difference of green shell, the thermal stress of square billet is reduced, reduces generous
Base continuous casting defect.It is 450mm × 360mm, the Medium Carbon Steel Containing Manganeses such as material 35Mn2,37Mn2 disclosure is particularly well suited to cross dimension
The continuous casting of bloom.But for 280mm × 380mm section bloom Properties of Heavy Rail Steel corner quality control equipments and technology
Specific research, be not directed to.
Invention content
The technical problem to be solved by the present invention is to：A kind of Continuous Casting Square of bloom Properties of Heavy Rail Steel corner quality control is provided
Method is suitable for 280mm × 380mm section blooms, may make big cross section Properties of Heavy Rail Steel strand corner solidification and heat transfer more uniform, outside
The defects of shape size is good, the thorough convex closure eliminated since corner inhomogeneous cooling is formed, crackle.
The technical solution adopted in the present invention is to solve above-mentioned technical problem：The corner quality control of bloom Properties of Heavy Rail Steel
Continuous cast method, bloom section are 280mm × 380mm, are equipped using the tube type mold of gradual taper, wherein designing crystallizer
Size suitable for reading is 292.2mm × 392.5mm, and crystallizer bottom size is 287.6mm × 388.0mm, and crystallizer middle part size is such as
Shown in following table：
It is further：The corner fillet size of tube type mold is R20mm.Strand corner defect control can be improved in this way
System.
It is further：The cooling water channel of tube type mold is two into two times, is had there are two water inlet and two water outlets,
Ensure heat transfer uniformity.
Normal casting process technical conditions are also needed to be supplemented as cooperation when in addition, implementing, the present invention preferably presses following technique
Technical conditions are implemented：
The process parameter control of the cooling water of crystallizer is water flow 2700L/min~2900L/min, hydraulic pressure 0.80MPa
~0.90MPa；
M-EMS Current intensity is that 320 ± 10Gs is configured by true field gaussian intensity, stir current
Frequency is controlled by 2.4Hz；
For the 1st heat of middle packet casting, cast superheat of liquid steel control is at 25 DEG C~45 DEG C；For the of middle packet casting
2~N heats, cast superheat of liquid steel control is at 15 DEG C~35 DEG C；
Casting speed control can according to target pulling rate 0.68m/min constant speed be poured into a mould in 0.63m/min~0.70m/min.
The beneficial effects of the invention are as follows：It is equipped using the tube type mold of gradual taper, and to the specific size of crystallizer
It rationally designs, it is made to simplify the structure, it is easier to which manufacture and maintenance, the cooling of optimization strand corner improve strand corner and lack
Fall into control.In addition, by the fillet parameter designing to tube type mold, the control of strand corner defect is further improved；And lead to
The improvement to cooling water channel is crossed, to ensure uniformity of conducting heat.Finally, in conjunction with control cast superheat of liquid steel, poring rate, electricity
Magnetic mixing parametric, cooling parameter etc., it is ensured that bloom heavy rail steel continuous casting billet comprehensive quality high level controls.
Specific implementation mode
With reference to embodiment, the invention will be further described.
Embodiment 1
The embodiment is certain steel mill equipment technology production 280mm × 380mm section U75V Properties of Heavy Rail Steel using the present invention.
The present invention specific implementation mode be：Crystallizer size suitable for reading is 292.2mm × 392.5mm, and crystallizer bottom size is
287.1mm × 388.0mm, corner size are R20mm arc chord angles；Size is as shown in the table in the middle part of crystallizer：
Secondly, design tube type mold water route is two into two times, ensures heat transfer uniformity.In addition, the cooling water of crystallizer
Amount is controlled by 2750L/min~2900L/min, and hydraulic pressure is controlled by 0.82MPa~0.90MPa.
The present invention also needs normal casting process technical conditions to be supplemented as cooperation, and specific control requires as follows：Pour into a mould molten steel
The degree of superheat (middle packet superheat of liquid steel) is controlled at 17 DEG C~34 DEG C, and particularly, for the first heat of middle packet, the degree of superheat is controlled 25
DEG C~43 DEG C；By casting speed control in 0.65m/min~0.70m/min, target pull rate 0.68m/min constant speed cast rates reach
95.6%；M-EMS Current intensity is that 320 ± 10Gs is configured by true field gaussian intensity, and stir current is strong
Degree is 350A ± 15A, and stir current frequency is 2.4Hz.
Casting process Mold liquid level stabilizing, covering slag flow into uniform.Low power detection is carried out to continuous casting blooms；
Corroded using cold sour dendrite, detection strand cross section shell thickness distribution situation, the results show that the U75V weights that the present invention is produced
Rail steel continuous casting blooms shell thickness is circumferentially distributed uniformly along section；Strand corner stable quality, the corner defects such as no convex closure,
Chemistry sample is drilled through using φ 5mm drill bits to continuous casting billet corner and carries out segregation inspection, the control of C element degree of segregation standard deviation
0.006~0.010.
Embodiment 2
The embodiment is certain steel mill equipment technology production 280mm × 380mm section U71Mn heavy rails using the present invention
Steel.The present invention specific implementation mode be：Crystallizer specific size (including size suitable for reading, bottom size, middle part size, corner
Size) it is same as Example 1；Secondly, design tube type mold water route is two into two times, ensures heat transfer uniformity.In addition, crystallization
The cooling water inflow of device is controlled by 2700L/min~2870L/min, and hydraulic pressure is controlled by 0.80MPa~0.87MPa.
The present invention also needs normal casting process technical conditions to be supplemented as cooperation, and specific control requires as follows：Pour into a mould molten steel
The degree of superheat (middle packet superheat of liquid steel) is controlled at 15 DEG C~32 DEG C, and particularly, for the first heat of middle packet, the degree of superheat is controlled 27
DEG C~41 DEG C；By casting speed control in 0.65m/min~0.70m/min, target pull rate 0.68m/min constant speed cast rates reach
93.9%；M-EMS Current intensity is that 320 ± 10Gs is configured by true field gaussian intensity, and stir current is strong
Degree is 350A ± 11A, and stir current frequency is 2.4Hz.
Casting process Mold liquid level stabilizing, covering slag flow into uniform.Low power detection is carried out to continuous casting blooms；
Corroded using cold sour dendrite, detection strand cross section shell thickness distribution situation, the results show that the U71Mn that the present invention is produced
Properties of Heavy Rail Steel continuous casting blooms shell thickness is circumferentially distributed uniformly along section；Strand corner stable quality, the corners such as no convex closure lack
It falls into, chemistry sample is drilled through using φ 5mm drill bits to continuous casting billet corner and carries out segregation inspection, C element degree of segregation standard deviation
Control is 0.006~0.009.
Embodiment 3
The embodiment is certain steel mill equipment technology production 280mm × 380mm section U78CrV heavy rails using the present invention
Steel.The present invention specific implementation mode be：Crystallizer specific size (including size suitable for reading, bottom size, middle part size, corner
Size) it is same as Example 1；Secondly, design tube type mold water route is two into two times, ensures heat transfer uniformity.In addition, crystallization
The cooling water inflow of device is controlled by 2740L/min~2900L/min, and hydraulic pressure is controlled by 0.82MPa~0.90MPa.
The present invention also needs normal casting process technical conditions to be supplemented as cooperation, and specific control requires as follows：Pour into a mould molten steel
The degree of superheat (middle packet superheat of liquid steel) is controlled at 17 DEG C~35 DEG C, and particularly, for the first heat of middle packet, the degree of superheat is controlled 27
DEG C~45 DEG C；By casting speed control in 0.65m/min~0.70m/min, target pull rate 0.68m/min constant speed cast rates reach
94.4%；M-EMS Current intensity is that 320 ± 10Gs is configured by true field gaussian intensity, and stir current is strong
Degree is 350A ± 12A, and stir current frequency is 2.4Hz.
Casting process Mold liquid level stabilizing, covering slag flow into uniform.Low power detection is carried out to continuous casting blooms；
Corroded using cold sour dendrite, detection strand cross section shell thickness distribution situation, the results show that the U78CrV that the present invention is produced
Properties of Heavy Rail Steel continuous casting blooms shell thickness is circumferentially distributed uniformly along section；Strand corner stable quality, the corners such as no convex closure lack
It falls into, chemistry sample is drilled through using φ 5mm drill bits to continuous casting billet corner and carries out segregation inspection, C element degree of segregation standard deviation
Control is 0.004~0.009.
Above-described embodiment illustrates that after technical scheme of the present invention, 280mm × 380mm section Properties of Heavy Rail Steel is generous
The corner quality control of base strand is good, and strand corner zero-fault, shell thickness is uniformly distributed circumferentially, strand corner homogenieity
Preferably, important foundation is established for strand internal rarefaction and the control of the effect of shrinkage cavity.
Claims (4)
1. the continuous cast method of bloom Properties of Heavy Rail Steel corner quality control, bloom section is 280mm × 380mm, it is characterised in that：
It is equipped using the tube type mold of gradual taper, wherein design crystallizer size suitable for reading is 292.2mm × 392.5mm, crystallizer
Bottom size is 287.1mm × 388.0mm, and crystallizer middle part size is as shown in the table：
2. the continuous cast method of bloom Properties of Heavy Rail Steel as described in claim 1 corner quality control, it is characterised in that：Tubular type crystallizes
The corner fillet size of device is R20mm.
3. the continuous cast method of bloom Properties of Heavy Rail Steel as described in claim 1 corner quality control, it is characterised in that：Tubular type crystallizes
The cooling water channel of device is two into two times, and there are two water inlet and two water outlets for tool.
4. the continuous cast method of the bloom Properties of Heavy Rail Steel corner quality control as described in any one of claims 1 to 3, feature
It is：The process parameter control of the cooling water of crystallizer be water flow 2700L/min~2900L/min, hydraulic pressure 0.80MPa~
0.90MPa；
M-EMS Current intensity is that 320 ± 10Gs is configured by true field gaussian intensity, stir current frequency
It is controlled by 2.4Hz；
For the 1st heat of middle packet casting, cast superheat of liquid steel control is at 25 DEG C~45 DEG C；For 2~N of middle packet casting
Heat, cast superheat of liquid steel control is at 15 DEG C~35 DEG C；
Casting speed control is in 0.63m/min~0.70m/min.
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| CN201810700684.4A CN108746526B (en) | 2018-06-29 | 2018-06-29 | Continuous casting method for controlling quality of large square billet heavy rail steel corner |
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| CN201810700684.4A CN108746526B (en) | 2018-06-29 | 2018-06-29 | Continuous casting method for controlling quality of large square billet heavy rail steel corner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110216253A (en) * | 2019-07-22 | 2019-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Bloom Properties of Heavy Rail Steel disperse is segregated control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110216253A (en) * | 2019-07-22 | 2019-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Bloom Properties of Heavy Rail Steel disperse is segregated control method |
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